How can one verify the integrity of the downloaded iso file from Red Hat Customer Portal?
Environment
- Red Hat Enterprise Linux ALL
Issue
- How can one verify the integrity of the downloaded iso file from Red Hat Customer Portal?
- How to verify the ISO image is intact before attempting installation?
Resolution
- To verify the downloaded ISO image is intact before attempting an installation, use a program to calculate the
sha256sumof the ISO file. If you do not have another Red Hat Enterprise Linux machine available to test the ISOs,sha256sumprograms for other operating systems can be found through a web search. If you have aRed Hat Enterprise Linuxavailable, you can use the includedsha256sumbinary.
$ sha256sum <filename.iso>
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At the shell prompt, replace "filename.iso" with the name with downloaded ISO file. When the command completes, it will return an alphanumeric string that is the checksum of the file. Compare that string to the one found in the Red Hat Customer Portal ISO download section. Here's how to find the checksums on the Red Hat Customer Portal:
- Log into the Red Hat Customer Portal with a current username and password.
- Click on the Downloads at top of the page
- Click on the Product that is Red Hat Enterprise Linux
- Click on All Red Hat Enterprise Linux Downloads
- Ensure that you select the appropriate Product Variant, Version and Architecture
- Compare the checksum of Red Hat Enterprise Linux with your ISO image checksum
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If the output from does not match the value on Red Hat Customer Portal, the ISO file is corrupted and will need to be downloaded again.
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Specifically for RHEL CoreOS images, find more details here.
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